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Metals 2015, 5(4), 2109-2118; doi:10.3390/met5042109

Dynamic Strain Evolution around a Crack Tip under Steady- and Overloaded-Fatigue Conditions

1
Department of Materials Science and Engineering, Chungnam National University, Daejeon 305-764, Korea
2
Department of Materials Science and Engineering, National Chiao Tung University, Hsinchu 300, Taiwan
3
Neutron Science Division, Korea Atomic Energy Research Institute, Daejeon 305-353, Korea
*
Author to whom correspondence should be addressed.
Academic Editor: Klaus-Dieter Liss
Received: 2 September 2015 / Revised: 26 October 2015 / Accepted: 4 November 2015 / Published: 12 November 2015
(This article belongs to the Special Issue Metals Challenged by Neutron and Synchrotron Radiation)
View Full-Text   |   Download PDF [933 KB, uploaded 12 November 2015]   |  

Abstract

We investigated the evolution of the strain fields around a fatigued crack tip between the steady- and overloaded-fatigue conditions using a nondestructive neutron diffraction technique. The two fatigued compact-tension specimens, with a different fatigue history but an identical applied stress intensity factor range, were used for the direct comparison of the crack tip stress/strain distributions during in situ loading. While strains behind the crack tip in the steady-fatigued specimen are irrelevant to increasing applied load, the strains behind the crack tip in the overloaded-fatigued specimen evolve significantly under loading, leading to a lower driving force of fatigue crack growth. The results reveal the overload retardation mechanism and the correlation between crack tip stress distribution and fatigue crack growth rate. View Full-Text
Keywords: fatigue; crack growth; overload; stress/strain; neutron diffraction fatigue; crack growth; overload; stress/strain; neutron diffraction
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Lee, S.Y.; Huang, E.-W.; Woo, W.; Yoon, C.; Chae, H.; Yoon, S.-G. Dynamic Strain Evolution around a Crack Tip under Steady- and Overloaded-Fatigue Conditions. Metals 2015, 5, 2109-2118.

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